Which is a better fit (i.e., results in less wasted space), a square peg in a round hole or a round peg in a square hole?
If you have not tried to solve the puzzle, have a go now. For everyone else the answer is after the break.
So, the answer is that a round peg fits into a square hole better than a square peg in a round hole. Ten points to the person that can give the clearest explanation of why this is the case!
I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.